10221012691 has 2 divisors, whose sum is σ = 10221012692. Its totient is φ = 10221012690.

The previous prime is 10221012689. The next prime is 10221012721. The reversal of 10221012691 is 19621012201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10221012691 - 2¹ = 10221012689 is a prime.

It is a super-2 number, since 2×10221012691² (a number of 21 digits) contains 22 as substring.

Together with 10221012689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (10221016691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5110506345 + 5110506346.

It is an arithmetic number, because the mean of its divisors is an integer number (5110506346).

Almost surely, 2^10221012691 is an apocalyptic number.

10221012691 is a deficient number, since it is larger than the sum of its proper divisors (1).

10221012691 is an equidigital number, since it uses as much as digits as its factorization.

10221012691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

Adding to 10221012691 its reverse (19621012201), we get a palindrome (29842024892).

The spelling of 10221012691 in words is "ten billion, two hundred twenty-one million, twelve thousand, six hundred ninety-one".